\documentclass{scrbook}

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%% Meta-Angaben für das Deckblatt

\title{Die offenen Geheimnisse des Latex-Text-Satz.}
\author{Peter Koppatz}
\date{2015}

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%% Wasserzeichen

\usepackage[firstpage]{draftwatermark}
\SetWatermarkText{Entwurf vom: \today}